Attachment for producing spiral stitches.



H. ADLER. ATTACHMENTFOR PRO'DUCING SPIRAL STITCHES.

APPLICATION FILED OCT. I7, |917- Patented Nov. 19, 1918r UNTTEE STATE@ EETEE' T FFEGE.

HERMAN ADLER, OF RICHMOND HILL, NEW YORK, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO BERSON & SCHLOSS, (INC.), OF NEW YORK, N. Y., A CORPORATION.

ATTACHMENT FOR PRODUCING SPIRAL STITCHES.

Speeication of Letters Patent. Patented Nov., 19, TETE.,

Application filed October 17, 1917'.v v,Serial No. 197,095.

To all whom t may concern.'

Be it known that I, HERMAN ADLER, a subject of the King of Roumania, residing at Richmond Hill, in the county of Queens and State of New York, have invented certain new and useful Improvements in Attachments for Producing Spiral Stitches, of which the following is a specification.

My invention is designed for producing a regulated spiral stitch upon rings of fabric for the purpose of stiffening them.

My invention i's particularly applicable to sewing such reinforcing spiral stitching upon the rings or bands of drill that are used for making sailors hats. Sailors hats have incorporated in them a ring or band of drill or similar material which is made by taking a long piece of fabric, overlapping its ends and fastening the overlapped ends by stitching at right angles to the length of the strip. Vhen these hats are washed the drill becomes limp so that the hat has an unsightly appearance and it is desirable to reinforce these rings or bands by a row of spiral stitching which has been found satisfactory for this purpose.

Such work formerly has been done by hand, the operator feeding the band forward in the direction of its circumference to the stitching mechanism of a sewing machine and at the Sametime moving the band transversely .1y so that the stitching would be a spiral. This was slow and fatiguing work andl rendered the hats eX- pensive because of the amount of labor required. In addition, said stitching was notv uniform as it was impossible to produce a spiral 'stitch having a uniform pitch. According to my invention a simple and ellicient attachment is secured which is made up of standard parts and can be readily applied to certain well-known sewing machines at present on the market, which furnishes a spiral stitch of uniform pitch in an automatic manner, so that the only labor required is to put the bands into place and to remove them. The pitch of the stitch can also be very minutely regulated and the stitch can be started at any portion of the ring or band.

Other advantages and objects of my invention will be pointed out in the following description and drawings which illustrate one embodiment of my invention.

Figure 1 is a plan view,

Fig. 2 is a sect-ion on line 2-2 of Fig. 1, and

Fig. 3 is a section on line 2%*3 of Fig. 2.

A countershaft 1, located underneath the bed of the machine drives a shaft l by means of the worm gearing 2 and 3. The shaft if, which has its bearings at and 30 in suitable brackets, drives a threaded shaft 9. having its bearings in suitable brackets S and 10, by means of the worm gears 6 and 7. The threaded shaft 9 is provided with al follower 12 which has a recess 26 of semi-circular shape and having a threaded interior which lits upon the threaded shaft 9 like half of a nut so that as the shaft 9 is ro` t-ated the follower 12 is caused to move toward the left.. The follower 12 is secured to a slidable shaft 13, which has its bearing in bracket-S11 and 10, by means of a set screw 14. The 'slidable shaft 13 has aiiixed thereto a headA 15', by means of a set screw 16. This head 15 has an arm 17 secured thereto.

At the left of the head 15 the shaft 13 has the bottom 23 of a holder for the ring or band of fabric secured thereto by means of the head 19 and the set screw 20. This holder is made of resilient metal and is somewhat convex in shape and is preferably of the lsame width as the bandor ringof fabric to be stitched.

The ring or band of fabric which. is placed on top of the bottom member 23 of the holder is kept in place by means of an upper member 22 provided with a right angled extension 24 secured thereto.. The bottom member 23 has vertical ears 48 secured thereto on each side, throughwhich a pintle 21 is passed, so that it is impossible to move the upper member 22 to the left of the pintle 2l, but the upper member 22 has a certain free'rocking movement with respect to the lower member 23.

The operation of my device is as follows The operator, by moving the member 18 to the left, throws the driving clutch member 51, mounted on the rotating shaft 50, out of contact with the driven clutch member 52, mounted on shaft 1. The clutch member 51 rotates with shaft 50, but can be slid thereon, and is urged to the right by spring 53. The member 18 slides in bearing 54. He then takes the ring of fabric which has been sewed together as before indicated, and places it so that a portion of its periphery takes the holder and moves it toward thel right until the stitching mechanism of the ordinary kind, as well as the feed dogs underneath the stitching mechanism, is in a line with any desired point of the ring or band which is now under it. The feed dogs are placed sufficiently close to the holder, to prevent any chewing or twisting of the' fabric, at any time.

The operator then, by tilting forward the holder, throws the follower 12 and the shaft' 9 into mesh and by throwing the member 18 to the right, sets the machine into motion. The band or ring will be fed forward and pulled through the holder in a direction parallel to its plane by the feed dogs, and

at the same time it will be moved transversely by the shaft V9, the follower 12 4and the other parts indicated before.

In this manner a very uniform spiral stitch is secured and when the arm 17 contacts with the member 18 and moves it to the left, the machine is automatically stopped. Any designated point of the band can be set into line with the stitching mechanism so that if a thread breaks, the stitching can be resumed at the point where the thread was broken.

The overlapped portions of the band or ring are, of course, of double thickness but this double thickness is accommodated by the advantageous construction ofthe holder. Thus, when the overlapping or double portion contacts with the frontl end. of the upper member 22, it lifts it up byA reason of the Y beveled shape of this end, and passes right through until it hits the rear end when the upper member 22 is rocked in the opposite direction and the doubled-over portion of the band passes out freely. At the same time the slight friction between the band and the holder maintains the upper member 22 against the pintle 21. The character of the stitch can be easily regulated by suitably changing the ratios between the various gears of the mechanism. Since the operation of the machine is absolutely automatic, any experienced person can attend to a number of machines so that the cost of labor is almost nothing. I

I have described a preferred embodiment of my invention but it is clear that my invention is not limited thereto, as numerous changes could be made in its details without departing from the spirit of my invention.

Lacasse I claim A 1. In combination with a stitching mechanism and the feed dogs of a sewing machine, a holder adapted to hold a band of fabric, the grip of said holder upon the said fabric being weaker than the grip of the feed`dogs thereon, so that the feed dogs of the machine can pull the said fabric through the said holder, and means for uniformly moving the said holder in a line transverse to the line of stitch, the said holder comprising a portion above the fabric, and a portion belowthe fabric, both said portions being moved with the fabric held between them. v

2. In combination with a stitching mechanism and the feed dogs of a sewing machine, a holder adapted to hold a band of fabric, said holder comprising an upper member and a lower member pressed against each other so as to grip the said fabric, the grip of the holder being weaker than the grip of the feed dogs, lso that the feed dogs can pull the said fabric through the said holder, the yupper member of said holder being vertically movable with respect to the lower member, and means for uniformly moving the said holder in a line transverse to the line of stitch, both said members being moved with the fabric betweenl them.

3. In combination with a stitching mechanism and the feed dogs of a sewing machine,

a holder for a band of fabric, comprising a` lower member and an upper member, the said members being pressed against each other to hold the said fabric [with a grip weaker than that of the feed dogs, so that the feed dogs can 'pull `the said fabric through the said holder, the upper member of said holder being capable of a free rocking -movement with respect to the lower member around an aXis intermediate the Y ends of said holder, and means for uniformly moving the said holder in a line transverse to the line of stitch.

4. In combination with a stitching mechanism and the feed dogs of a sewin machine a holder adapted to reevingly ho d a band of fabric, said holder comprising a lower member at right angles to the direction of feed with vertical ears on each side, a pintle passed through said vertical ears atright angles tothe line of stitch, and an upper member having a vertical lug adapted to bear against the said pintle, the said upper member having a free vertical movement with respect to the said lower member, the said feed. dogs being adapted to pull said band through said holder.

5. In combination with a stitching mechanism and feed dogs ofa sewing machine, a holder for a band of fabric, the grip of said holder upon said fabric being weaker than that of the feed dogs, so that the'said feed dogs can pull the fabric through said holder,

mass

a shaft upon which said holder is carried and mounted so as to have both a rocking movement and a longitudinalsliding movement7 a second shaft having a threaded periphery and parallel to the first mentioned shaft, means for driving said second mentioned shaft, and a threaded member carried by said first mentioned shaft and adapted to mesh with the threadings on said second mentioned shaft, whereby the rotation of said second mentioned shaft causes a unform sliding movement of the said first mentioned shaft and the said holder.

6. In combination with a stitching mechanism and feed dogs of a sewing machine, connecting means for connecting the` said sewing machine to a source of power for driving the same, a holder adapted to hold a band of fabric with a grip weaker than that of the feed dogs, so that the feed dogs can pull the fabric through the said holder, means for uniformly moving said holder in a line transverse to the line of stitch, and disconnecting means operated by said holder for disconnecting the said connecting means from the source of povverV at a predetermined point in the transverse movement of the said holder.

7. In combination with a stitching mechanism and the feed dogs ofa sewin machine, a holder adapted to hold a ban of fabric with a grip weaker than that of the feed dogs, so that the feed dogs can pull .the said fabric through the said holder, a shaft carrying said holder and mounted so as to have both a rocking and a longitudinal sliding movement to a second shaft having a. threaded exterior, operating means for operating said sewing machine and said second mentioned shaft, a member carried by said first mentioned shaft and capable of being put into mesh with said threadings, s0

'that the holder and the shaft are moved in a direction parallel to the length of the shaft, and a disconnecting arm operated by said first mentioned shaft and capable of disconnecting the said connecting means at a predetermined point in the movement of the said holder.

In testimony whereof I hereunto aix my signature. l

HERMAN ADLER. 

